Iron-silicon ingot.



UNITED STATES PATENT OFFICE.

EUGENE A. BYRNES, OF WASHINGTON, DISTRICT OF COLUMBIA, ASSIGNOR TO PITTS- BURGH PURE METAL PRODUCTS COMPANY, OF PITTSBURGH, PENNSYLVANIA, A

CORPORATION OF PENNSYLVANIA.

IRON-SILICON INGOT.

No Drawing.

To all whom it may concern:

Be it known that I, EUGENE A. BYRNES, a citizen of the United States, residing at Washington, in the District of Columbia, have invented certain 'new and useful Improvements in Iron-Silicon Ingots, of which the following is a specification.

It is now Well recognized that ordinary Bessemer and open-hearth steels rust more readily than wrought or puddled iron, and that the manganese commonly used as a deoxidizing addition in the production of such steels is apt tosegregate and increases the rate of corrosion.

The present invention is a cast ingot, for conversion into such commercial shapes and articles as are exposed to atmospheric and oxidizing influences, consisting almost entirely of iron; containing very little carbon, sulfur, phosphorus, manganese, oxygen and nitrogen; and having alloyed therewith a small amount of silicon. The preferred productcontains up to 99.7 per cent. of iron; not over 0.15 total per cent. of carbon, sulfur, phosphorus, manganese, oxygen and nitrogen; and 0.15 per cent. or more of silicon. This product is preferably manufactured in the basic open-hearth with basic additions, from a charge of pure pig iron and wroughtiron scrap. The temperature is raised to and maintained at a high point throughout the purification, without unduly increasing the oxidizing character of the flame, until the.

carbon, sulfur, phosphorus, manganese and silicon have been reduced to a total per cent. of not over 0.15. The combined oxygen is preferably removed by the use of both sillcon and titanium, the latter also serving to practically eliminate the nitrogen. The silicon may be added in the form of the 50% ferro-alloy; the titanium as a 30% Specification of Letters Patent.

- Application filed January 28, 1911.

- hearth furnace into an electric furnace.

Patented Oct. 3, 1911.

Serial No. 605,298.

ferro-alloy. Theferro-alloys may be added at the end of the purifying stage, or portions of them may be added toward the end of the treatment. The silicon is added in such excess as to leave the desired per cent., say from 0.10 to 0.15 in the finished product. The titanium is preferably added in the minimum amount necessary to eliminate oxygen and nitrogen. In som'ecases it may be desirable, in order to readily obtain a high temperature and facilitate the final reaction, to tap the metal from the open- The slag may then be largely removed in transit, a neutral'atmosphere being maintained in the electric furnace.

I claim 1. As a new article of manufacture, a cast ingot containing at least 99.5 per cent. of iron; not over 0.15 total per cent. of carbon, sulfur, phosphorus and manganese; and at least 0.10 per cent. of silicon.

2. As a new article of manufacture, a cast ingot containing at least 99.5 per cent. of iron; not over 0.15 total per cent. of carbon, sulfur, phosphorus, manganese, oxygen and nitrogen; and at least 0.10 per cent. of silicon.

3: As a new article of manufacture, a cast ingot containing from 99.5 to 99.7 per cent. of iron; not over 0.15 total per cent. of carbon, sulfur, phosphorus, manganese, oxygen and nitrogen; and at least 0.15 per cent. of silicon.

In testimony whereof, afiix'my signature in presence of two w1tnesses..

ROBERT I. I-Imsrznn, JOHN H. Sreonns. 

